Failure of inland valleys development: A hydrological diagnosis of the Bankandi valley in Burkina Faso

Yira Yacouba, Bossa Aymar Yaovi, Keïta Amadou, Fusillier Jean-Louis, Serpantié Georges, Yameogo Thomas B., Idrissou Mouhamed, Lidon Bruno. 2019. Failure of inland valleys development: A hydrological diagnosis of the Bankandi valley in Burkina Faso. Modeling Earth Systems and Environment, 5 (4) : 1733-1741.

https://doi.org/10.1007/s40808-019-00628-5

Article de revue ; Article de recherche ; Article de revue à comité de lecture

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Résumé : Several developed inland valleys for rice production were abandoned due to poor design or implementation. The Bankandi inland valley (BIV) is a contour bunds system developed in 2006 by a development project, currently experiencing a systematic waterlogging. This study assessed: (1) the waterlogging vs. changing hydro-climatic conditions relationship; (2) the hydrological design and implementation of water control infrastructures; and (3) how digital elevation models (DEMs) data could be used for inland valleys development. To investigate the waterlogging vs. changing hydro-climatic conditions (precipitation and discharge), the conceptual HBV model was applied; coupled with break and trend detections tests. To evaluate the accuracy of the location of drainage flume and contour bunds, a topographic survey using a D-GPS was performed. To explore free DEMs as support tool in the development of inland valley, the Shuttle Radar Topography Mission 1 and the Advanced Spaceborne Thermal Emission and Reflection Radiometer 1, were used. The results show that: (1) the waterlogging was not related to changing environmental conditions; (2) major flaws including bunds not implemented on contour lines contribute to the waterlogging; (3) free DEMs were not accurate enough for valley development. The overall diagnostic of BIV entails conducting basic hydrological investigations prior to implementation.

Mots-clés Agrovoc : hydrologie, Engorgement du sol, bilan hydrique, ouvrage hydraulique, vallée, gestion des eaux, télédétection

Mots-clés géographiques Agrovoc : Burkina Faso

Mots-clés libres : Inland valley, Topographic survey, Waterlogging, Remote Sensing, HBV

Classification Agris : P10 - Ressources en eau et leur gestion
P11 - Drainage

Champ stratégique Cirad : CTS 5 (2019-) - Territoires

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